HP 39gII

Inference app 107
Two-Sample Z-Test
Menu name Z-Test: μ
1
– μ
2
On the basis of two samples, each from a separate
population, this test measures the strength of the evidence
for a selected hypothesis against the null hypothesis. The
null hypothesis is that the mean of the two populations are
equal, Η
0
: μ
1
= μ
2
.
You select one of the following alternative hypotheses to
test against the null hypothesis:
Inputs The inputs are:
Results The results are:
Critical
Boundary value(s) of
required by the α value that you
supplied.
Result Description
x
x
H
1
:μ
1
μ
2
<
H
1
:μ
1
μ
2
>
H
1
:μ
1
μ
2
≠
Field name Definition
Sample 1 mean.
Sample 2 mean.
n
1
Sample 1 size.
n
2
Sample 2 size.
σ
1
Population 1 standard
deviation.
σ
2
Population 2 standard
deviation.
α Significance level.
x
1
x
2
Result Description
Test Z Z-Test statistic.